题目内容
阅读理解
Light travels at a speed which is about a million times faster than that of sound. In one second, light travels about 300,000 kilometers, but sound travels only 344 metros. You can get some idea of this difference by watching the start of a running match. If you stand quite away from the starter(发令员), you can see smoke come from his gun before the sound reaches your ears.
The fast speed of light produces some strange facts. Sunlight takes about 8 minutes to reach us. If you look at the light of the moon tonight, remember that the light rays(射线)left the moon 1.3 seconds before they reached you. The nearest star is so far away that the light which you can see from it tonight to travel to you 4 years ago at a speed of nearly 2 million kilometers every minute. The light from some of tonight’s stars started on its journey towards you even before you were born.
Thus, if we want to be honest, we cannot say, “The stars are shining brightly tonight.” We have to say, “The stars look pretty. They were shining four years ago but their light has just reached out earth.”
1. The best title(题目)of this passage is ________.
[ ]
A. Light Travels Faster than Sound
B. Stars Are Very Far Away from us
C. The Speed of Light
D. It’s Not Correct to Say “The Stars Are Shining Brightly Tonight”
2. If you stand 200 metros away from a man who is firing a gun to start a running match, you will find out that ________.
[ ]
A. light travels a million times faster than sound
B. the smoke of the gun gets into your sight after the sound of the gun-shot
C. sound travels less fast than light
D. the sound of the gun will reach you at the same time with the light of the smoke
3. Sunlight obviously ________ than the light of the moon.
[ ]
A. has to travel a greater distance
B. moves less quickly
C. travels much more quickly
D. is less powerful
4. The scientific way of saying “The stars are shining brightly tonight” should be ________.
[ ]
A. the stars have been shining all the time
B. the stars seen tonight will be shining four years later
C. the stars were shining long ago but are seen tonight
D. the star light seen tonight could be seen four years ago
5. The light of the nearest star you see tonight has been ________ for years.
[ ]
A. on the earth B. on the moon
C. away from the sun D. away from itself
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